The document discusses issues related to the design of the Article 6.4 mechanism for the Paris Agreement. It notes that using a single baseline approach would not work due to variability between sectors and countries. It also says the relationship between conservative baselines and incentives for project developers, as well as how baselines interact with national climate commitments and incentives, needs to be resolved. The document is from a meeting of the Climate Change Expert Group to discuss these challenges in designing the Article 6.4 mechanism.